import java.awt.*;
import java.awt.event.*;
import java.util.Random;
public class Tank {
    private int x, y,oldX,oldY;
    public static final int XSPEED = 5;
    public static final int YSPEED = 5;
    private boolean bL = false,
            bU = false, bR = false, bD = false;
    public static final int WIDTH = 30;
    public static final int HEIGHT = 30;
    TankClient tc= null;
    private boolean live = true;
    private static Random r = new Random();
    private int step =r.nextInt(12) + 3;
    private static int Life;
    public BloodBar bb=new BloodBar();
    public boolean isLive(){
        return live;
    }
    public boolean isGood() {
        return good;
    }

    public void setLive(boolean live) {
        this.live = live;
    }
    public Rectangle getRect(){
        return new Rectangle(x,y,WIDTH,HEIGHT);
    }
    enum Direction {L, LU, U, RU, R, RD, D, LD, STOP};

    private Direction dir = Direction.STOP;
    private Direction ptDir = Direction.D;
    private boolean good;

    public static int getLife() {
        return Life;
    }

    public static void setLife(int life) {
        Life = life;
    }

    public Tank(int x, int y, boolean good) { this.x = x;
        this.y = y;
        this.good = good;
        if (good){
            this.setLife(100);
        }
    }

    public Tank(int x, int y, boolean good, TankClient tc) {
        this(x, y, good);
        if (good){
            this.setLife(100);
        }
        this.tc = tc;
    }
    public Tank(int x, int y, boolean good, Direction dir, TankClient tc) {
        this(x, y, good);
        this.dir = dir;
        this.oldX = x;
        this.oldY = y;
        this.tc = tc;
    }

    public void draw(Graphics g) {
        if (!live){
            tc.tanks.remove(this);
            return;
        }
        Color c = g.getColor();
        if(good) {
            bb.draw(g);
        }
        if(good) {
            g.setColor(Color.RED);
        }
        else {
            g.setColor(Color.YELLOW);
        }
        g.fillOval(x, y, WIDTH, HEIGHT);
        g.setColor(c);
        move();
        switch (ptDir) {
            case L:g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x, y + Tank.HEIGHT / 2);break;
            case LU : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x, y);break;
            case U : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x + Tank.WIDTH / 2, y);break;
            case RU : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x + Tank.WIDTH, y);break;
            case R : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x + Tank.WIDTH, y + Tank.HEIGHT / 2);break;
            case RD : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x + Tank.WIDTH, y + Tank.HEIGHT);break;
            case D : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x + Tank.WIDTH / 2, y + Tank.HEIGHT);break;
            case LD : g.drawLine(x + Tank.WIDTH / 2, y + Tank.HEIGHT / 2, x, y + Tank.HEIGHT);break;
            case STOP : break;
        }
    }
    void move() {
        this.oldX = x;
        this.oldY = y;
        switch(dir) {
        case L:
        x -= XSPEED;
        break; case LU:
        x-= XSPEED; y -= YSPEED;
        break; case U:
        y-= YSPEED;
        break; case RU:
        x += XSPEED; y -= YSPEED;
        break; case R:
        x += XSPEED;
        break; case RD:
        x += XSPEED; y += YSPEED;
        break; case D:
        y += YSPEED;
        break; case LD:
        x -= XSPEED; y += YSPEED;
        break; case STOP:
        break;
    }
        if(this.dir != Direction.STOP) {
            this.ptDir = this.dir;
        }
        if(x < 0) x = 0;
        if(y < 25) y = 25;
        if(x + Tank.WIDTH > TankClient.GAME_WIDTH) x = TankClient.GAME_WIDTH - Tank.WIDTH;
        if(y + Tank.HEIGHT > TankClient.GAME_HEIGHT) y = TankClient.GAME_HEIGHT - Tank.HEIGHT;
        if(!good) {
            Direction[] dirs = Direction.values();
            if(step == 0) {
                step = r.nextInt(12) + 3;
            int rn = r.nextInt(dirs.length); dir = dirs[rn];
        }
        step--;
        if(r.nextInt(40) > 38) this.fire();
    }
    }
    public void KeyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        switch(key) {
            case KeyEvent.VK_F2:
                if(!this.live) {
                    this.live = true;
                    this.Life = 100;
                }
                break;
        case KeyEvent.VK_LEFT: bL = true; break;
        case KeyEvent.VK_UP: bU = true; break;
        case KeyEvent.VK_RIGHT: bR = true;
            break;
        case KeyEvent.VK_DOWN: bD = true;
            break;
    }
        locateDirection();
    }
    void locateDirection() {
        if(bL && !bU && !bR && !bD) dir = Direction.L;
        else if(bL && bU && !bR && !bD) dir = Direction.LU;
        else if(!bL && bU && !bR && !bD) dir = Direction.U;
        else if(!bL && bU && bR && !bD) dir = Direction.RU;
        else if(!bL && !bU && bR && !bD) dir = Direction.R;
        else if(!bL && !bU && bR && bD) dir = Direction.RD;
        else if(!bL && !bU && !bR && bD) dir = Direction.D;
        else if(bL && !bU && !bR && bD) dir = Direction.LD;
        else if(!bL && !bU && !bR && !bD) dir = Direction.STOP;
    }
    public void KeyReleased(KeyEvent e) {
        int key = e.getKeyCode(); switch(key) {
            case KeyEvent.VK_CONTROL: fire();
                break;
        case KeyEvent.VK_LEFT: bL = false;
            break;
        case KeyEvent.VK_UP: bU = false; break;
        case KeyEvent.VK_RIGHT: bR = false;
            break;
        case KeyEvent.VK_DOWN: bD = false;
            break;
            case KeyEvent.VK_A: superFire(); break;
    }
        locateDirection();
    }
    public Missile fire() {
        int x = this.x + Tank.WIDTH / 2 - Missile.WIDTH / 2;
        int y = this.y + Tank.HEIGHT /2 - Missile.WIDTH / 2;
        Missile m = new Missile(x, y, good,ptDir,this.tc);
        tc.missiles.add(m);
        return m;
    }
    public Missile fire(Direction dir) {
        if(!live) return null;
//保证子弹从Tank的中间出现
        int x = this.x + Tank.WIDTH / 2 - Missile.WIDTH / 2;
        int y = this.y + Tank.HEIGHT /2 - Missile.WIDTH / 2;
        Missile m = new Missile(x, y, good, dir, this.tc);
        tc.missiles.add(m);
        return m;
    }
    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }
    private void stay(){
        x = oldX;
        y = oldY;
    }
    public boolean collidesWithWall(Wall w) {
        if(this.getRect().intersects(w.getRect()) &&
                this.live) {
            this.stay();
            return true;
        }
        return false;
    }
    public boolean collidesWithTanks(java.util.List<Tank> tanks) {
        for(int i = 0; i < tanks.size(); i++) {
            Tank t = tanks.get(i);
            if(this != t) {
                if(this.live && t.isLive() &&
                        this.getRect().intersects(t.getRect())) { t.stay();
                    this.stay(); return true;
                }
            }
        }
        return false;
    }
    private void superFire() {
        Direction[] dirs = Direction.values();
        for(int i = 0; i < 8; i++) {
            fire(dirs[i]);
        }
    }
    private class BloodBar {
        public void draw(Graphics g) { Color c = g.getColor(); g.setColor(Color.RED);
            g.drawRect(x, y - 20, WIDTH, 10);
            int w = WIDTH * Life / 100;
            g.fillRect(x, y - 20, w, 10); g.setColor(c);
        }
    }
    public boolean eat(Blood b) {
        if(this.live && b.isLive() &&
                this.getRect().intersects(b.getRect())) {
            setLife(100);
            b.setLive(false);
            return true;
        }
        return false;
    }
}
